:root {
  --bg: #f6f7f2;
  --ink: #17211b;
  --muted: #667066;
  --line: #d9decf;
  --surface: #ffffff;
  --accent: #0f8f78;
  --accent-ink: #06362f;
  --warm: #eeb85c;
  --reader-bg: #fbf3df;
  --reader-surface: #fffaf0;
  --reader-ink: #221b12;
  --reader-line: #eadbbd;
  --reader-shadow: 0 18px 60px rgba(70, 54, 26, 0.16);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    linear-gradient(135deg, rgba(15, 143, 120, 0.14), transparent 36%),
    linear-gradient(315deg, rgba(238, 184, 92, 0.24), transparent 34%),
    var(--bg);
  font-family: "Avenir Next", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
}

body.reader-active {
  background:
    linear-gradient(180deg, rgba(251, 243, 223, 0.94), rgba(246, 247, 242, 0.98)),
    var(--reader-bg);
}

.app-shell {
  width: min(1080px, calc(100% - 32px));
  margin: 0 auto;
  padding: 36px 0;
}

.hero {
  min-height: auto;
  display: grid;
  align-content: start;
  gap: 20px;
  padding: 44px 0 18px;
  border-bottom: 1px solid var(--line);
}

.hero-meta,
.hero-main {
  display: grid;
  grid-template-columns: minmax(0, 70%) minmax(240px, 30%);
  gap: 28px;
  align-items: start;
}

.hero-topline {
  display: flex;
  align-items: center;
  width: 100%;
}

.eyebrow {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  flex-wrap: wrap;
  margin: 0;
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}

.eyebrow-en {
  color: var(--muted);
  font-size: 12px;
  font-weight: 600;
  text-transform: none;
}

h1 {
  margin: 0;
  font-size: clamp(44px, 7vw, 88px);
  line-height: 0.95;
}

.summary {
  max-width: none;
  margin: 22px 0 0;
  color: var(--muted);
  font-size: clamp(18px, 1.75vw, 20px);
  line-height: 1.65;
}

.status-panel {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.74);
  padding: 18px;
  backdrop-filter: blur(14px);
}

.language-toggle {
  justify-self: end;
  flex: 0 0 auto;
  min-width: 44px;
  min-height: 26px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #ffffff;
  cursor: pointer;
  font: inherit;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.04em;
  padding: 0 10px;
}

.language-toggle:focus-visible {
  outline: 2px solid var(--warm);
  outline-offset: 3px;
}

.status-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.status-row:last-child {
  border-bottom: 0;
}

.status-row span {
  color: var(--muted);
}

.status-row strong {
  color: var(--accent-ink);
  text-align: right;
}

.workflow {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 28px;
  background: var(--line);
  border: 1px solid var(--line);
}

.upload-surface {
  display: grid;
  grid-template-columns: minmax(0, 55%) minmax(0, 45%);
  gap: 22px;
  align-items: start;
  margin-top: 28px;
  padding: 24px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
}

.upload-surface h2 {
  margin-top: 18px;
}

.upload-surface p {
  max-width: 560px;
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.upload-form {
  display: grid;
  gap: 12px;
  width: 100%;
}

.upload-form button {
  width: 100%;
}

.file-picker input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.file-picker span,
.upload-form button {
  display: flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--accent);
  font: inherit;
}

.file-picker span {
  color: var(--accent-ink);
  background: #ffffff;
  padding: 0 14px;
  overflow-wrap: anywhere;
}

.file-picker {
  display: block;
}

.file-picker span {
  min-height: 112px;
  border-style: dashed;
  transition: background 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.file-picker.is-dragging span {
  background: rgba(15, 143, 120, 0.1);
  border-color: var(--warm);
  transform: translateY(-2px);
}

.upload-form button {
  color: #ffffff;
  background: var(--accent);
  cursor: pointer;
}

.upload-result {
  grid-column: 1 / -1;
  min-height: 24px;
  color: var(--muted);
}

.upload-result dl {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
}

.upload-result div {
  min-width: 0;
  padding: 12px;
  background: #ffffff;
}

.upload-result dt {
  color: var(--muted);
  font-size: 12px;
}

.upload-result dd {
  margin: 4px 0 0;
  color: var(--ink);
  overflow-wrap: anywhere;
}

.preview-surface {
  margin-top: 28px;
  border: 1px solid var(--line);
  background: var(--reader-surface);
  box-shadow: var(--reader-shadow);
}

.preview-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 20px 24px;
  border-bottom: 1px solid var(--reader-line);
}

.preview-heading h2 {
  margin: 8px 0 0;
}

.preview-heading p {
  margin: 6px 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.preview-copy {
  min-width: 0;
}

.reader-toggle {
  min-height: 42px;
  min-width: 132px;
  border: 1px solid var(--reader-ink);
  background: var(--reader-ink);
  color: var(--reader-surface);
  cursor: pointer;
  font: inherit;
  font-size: 14px;
  font-weight: 800;
}

.preview-actions {
  display: flex;
  align-items: start;
  gap: 14px;
  flex: 0 0 45%;
  width: 45%;
}

.control-group {
  display: grid;
  grid-template-columns: 1fr;
  align-content: start;
  gap: 10px;
  flex: 1 1 0;
  min-width: 0;
}

.long-image-toggle {
  position: relative;
  display: inline-flex;
  min-height: 42px;
  min-width: 0;
  width: 100%;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--reader-line);
  background: #ffffff;
  color: var(--accent-ink);
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  font-weight: 700;
}

.long-image-toggle input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.long-image-toggle span {
  display: flex;
  width: 100%;
  min-height: 40px;
  align-items: center;
  justify-content: center;
  padding: 0 14px;
}

.long-image-toggle input:checked + span {
  background: var(--reader-ink);
  color: var(--reader-surface);
}

.long-image-toggle input:focus-visible + span {
  outline: 2px solid var(--warm);
  outline-offset: -2px;
}

.secondary-action {
  min-height: 42px;
  min-width: 0;
  border: 1px solid var(--accent);
  background: #ffffff;
  color: var(--accent-ink);
  cursor: pointer;
  font: inherit;
  font-size: 14px;
  font-weight: 800;
}

.format-switch {
  position: relative;
  display: inline-flex;
  min-height: 42px;
  min-width: 0;
  width: 100%;
  align-items: center;
  cursor: pointer;
}

.format-switch input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}

.format-switch-track {
  position: relative;
  display: grid;
  width: 100%;
  min-height: 42px;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  border: 1px solid var(--reader-line);
  background: #ffffff;
  color: var(--accent-ink);
  overflow: hidden;
}

.format-switch-track::before {
  content: "";
  position: absolute;
  inset: 3px auto 3px 3px;
  width: calc(50% - 3px);
  background: var(--accent);
  transition: transform 180ms ease;
}

.format-switch-track span {
  position: relative;
  z-index: 1;
  text-align: center;
  font-size: 13px;
  font-weight: 700;
  padding: 0 14px;
  transition: color 180ms ease;
}

.format-switch-track span:first-child {
  color: #ffffff;
}

.format-switch input:checked + .format-switch-track::before {
  transform: translateX(100%);
}

.format-switch input:checked + .format-switch-track span:first-child {
  color: var(--accent-ink);
}

.format-switch input:checked + .format-switch-track span:last-child {
  color: #ffffff;
}

.format-switch input:focus-visible + .format-switch-track {
  outline: 2px solid var(--warm);
  outline-offset: 3px;
}

.format-switch.is-disabled {
  cursor: not-allowed;
  opacity: 0.42;
}

.format-switch.is-disabled .format-switch-track {
  pointer-events: none;
}

.action-group .reader-toggle,
.action-group .secondary-action {
  min-width: 0;
  width: 100%;
}

.action-group {
  justify-items: stretch;
}

.reader-toggle:disabled,
.secondary-action:disabled {
  cursor: not-allowed;
  opacity: 0.42;
}

#preview-frame {
  display: block;
  width: 100%;
  min-height: 520px;
  border: 0;
  background: var(--reader-surface);
}

.preview-surface.is-reading {
  margin: 18px auto 0;
  max-width: min(980px, calc(100vw - 28px));
  min-height: calc(100vh - 36px);
  position: relative;
  z-index: 3;
}

.preview-surface.is-reading #preview-frame {
  min-height: calc(100vh - 132px);
}

.workflow article {
  min-height: 120px;
  padding: 22px;
  background: rgba(255, 255, 255, 0.72);
}

.step {
  color: var(--warm);
  font-weight: 800;
}

h2 {
  margin: 30px 0 10px;
  font-size: 24px;
}

.workflow p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

@media (max-width: 760px) {
  .app-shell {
    width: min(100% - 22px, 520px);
    padding: 20px 0;
  }

  .hero {
    padding: 28px 0 14px;
  }

  .hero-meta,
  .hero-main {
    grid-template-columns: 1fr;
  }

  .summary {
    font-size: 17px;
  }

  .workflow {
    grid-template-columns: 1fr;
  }

  .upload-surface {
    grid-template-columns: 1fr;
    padding: 18px;
  }

  .upload-result dl {
    grid-template-columns: 1fr;
  }

  .preview-heading {
    display: grid;
    gap: 14px;
    padding: 18px;
  }

  .preview-heading h2 {
    margin-top: 12px;
  }

  #preview-frame {
    min-height: 440px;
  }

  .reader-toggle {
    width: 100%;
  }

  .preview-actions {
    display: grid;
    grid-template-columns: 1fr;
  }

  .format-switch,
  .long-image-toggle,
  .control-group,
  .secondary-action {
    width: 100%;
  }

  .preview-surface.is-reading {
    max-width: 100%;
    min-height: calc(100vh - 20px);
    margin-top: 10px;
  }

  .preview-surface.is-reading #preview-frame {
    min-height: calc(100vh - 150px);
  }
}